|Name(s)|Yard no.|Type (as built)|Owner|IMO number|Laid down|Launched|Delivered/ Commissioned|Fate/ Decommissioned|Notes|
|---|---|---|---|---|---|---|---|---|---|
|Sally|100|Yacht|Lyman|Unknown|Unknown|Unknown|Unknown|Unknown||
|Caprice|101|Yacht|Robinson|Unknown|Unknown|Unknown|Unknown|Unknown||
|Eleanor|103|Yacht|Clapp|Unknown|Unknown|Unknown|Unknown|Unknown||
|USS Lawrence (DD-8)|104|Bainbridge-class destroyer|U.S. Navy|Unknown|10 April 1899|7 November 1900|7 April 1903|20 June 1919|Sold to Joseph G. Hitner; scrapped|
|USS Macdonough (DD-9)|105|Bainbridge-class destroyer|U.S. Navy|Unknown|10 April 1899|24 December 1900|5 September 1903|3 September 1919|Sold to Joseph G. Hitner; scrapped|
|Jule|106|Yacht|J. Arthur|Unknown|Unknown|Unknown|12 June 1899|Unknown||
|United States lightship LV-72|107|Lightvessel|U.S Lighthouse Board|Unknown|Unknown|Unknown|13 February 1901|Unknown||

Question: tell me the total number that were laid down on an unknown date.
Answer: 5